Lots of debate on the flash versus no flash/IR. Just yesterday i was reviewing some recent pics off my Moultire D-40 w/flash and caught a buck at night at a scrape..working it over and brushing up against the licking branch, then loitering around the spot..all told about a half dozen pcitures w/ flash and apparently he was not bothered by it. Mind you this is as the firearms season is wrapping up in NJ so the deer are still skiddish, very much nocturnal, and traveling through the thick stuff. So for me I will probably get another D-40 or two w/ flash, they don't seem bothered by it. The only advantage (for me) that I see in getting the IR cameras is the clarity at greater distances of the shot. To answer your specific question regarding the red flash it would probably help, my question would be what is the quality of the photos and can you make out the shots of deer a greater distances?